Who opened the Channel Tunnel in 1994 after how many years of construction?

Queen Elizabeth II and President Francois Mitterrand after 6 years of construction

Notes:

According to Reuters Roger Bannister dreamed of taking part in the Oxford Cambridge boat race but being 180 cm tall and weighing 68 kilos was told he was too tall and light to ever make a good oarsman. His record lasted just 46 days. My father was at Oxford at the time. He could have gone to watch Bannister but preferred instead to go see Bradman play cricket.